期刊
NATURE MATERIALS
卷 16, 期 11, 页码 1142-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4976
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资金
- French National Research Agency under Idex@Sorbonne University for the Future Investments programme [ANR-11-IDEX-0004-02]
- German Federal Ministry of Education and Research (BMBF) [16N11929]
- Royal Society [UF130329]
- EPSRC [EP/L000202]
- US DOE [DE-AC02-06CH11357]
- EPSRC [EP/K016288/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K016288/1] Funding Source: researchfish
In contrast to monovalent lithium or sodium ions, the reversible insertion of multivalent ions such as Mg2+ and Al3+ into electrode materials remains an elusive goal. Here, we demonstrate a new strategy to achieve reversible Mg2+ and Al3+ insertion in anatase TiO2, achieved through aliovalent doping, to introduce a large number of titanium vacancies that act as intercalation sites. We present a broad range of experimental and theoretical characterizations that show a preferential insertion of multivalent ions into titanium vacancies, allowing a much greater capacity to be obtained compared to pure TiO2. This result highlights the possibility to use the chemistry of defects to unlock the electrochemical activity of known materials, providing a new strategy for the chemical design of materials for practical multivalent batteries.
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